LSM303AGR Datasheet, PDF (26/68 Pages) STMicroelectronics – ultra-low-power 3D accelerometer and 3D magnetometer

Functionality
LSM303AGR
4.2
4.2.1
Accelerometer
Accelerometer power modes
The LSM303AGR accelerometer provides three different linear acceleration operating
modes: high-resolution mode, normal mode and low-power mode.
The table below summarizes how to select the different operating modes.
Table 13. Operating mode selection
Operating mode
CTRL_REG1_A[3]
(LPen bit)
CTRL_REG4_A[3]
(HR bit)
BW [Hz]
Turn-on
time [ms]
So @ ±2 g
[mg/digit]
Low-power mode
(8-bit data output)
1
0
ODR/2
1
16
Normal mode
(10-bit data output)
0
0
ODR/2
1.6
4
High-resolution mode
(12-bit data output)
0
1
ODR/9 7/ODR
1
Not allowed
1
1
--
--
--
The turn-on time to transition to another operating mode is given in Table 14.
Table 14. Turn-on time for operating mode transition
Operating mode change
Turn-on time
[ms]
12-bit mode to 8-bit mode
12-bit mode to 10-bit mode
1/ODR
1/ODR
10-bit mode to 8-bit mode
1/ODR
10-bit mode to 12-bit mode
7/ODR
8-bit mode to 10-bit mode
8-bit mode to 12-bit mode
1/ODR
7/ODR
Operating
mode [Hz]
1
10
25
50
100
200
400
Table 15. Current consumption of operating modes
Low-power mode
(8-bit data output)
[μA]
Normal mode
(10-bit data output)
[μA]
High resolution
(12-bit data output)
[μA]
2
2
2
3
4
4
4
6
6
6
11
11
10
20
20
18
38
38
36
73
73
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